How to sum values from Java Hashmap

2018-06-07 20:50:48

This question already has an answer here:

How to efficiently iterate over each entry in a 'Map'? 38 answers

If you need to add all the values in a Map , try this:

float sum = 0.0f;
for (float f : map.values()) {
    sum += f;
}

At the end, the sum variable will contain the answer. So yes, for traversing a Map 's values it's best to use a for loop.

You can definitely do that using a for-loop . You can either use an entry set:

for (Entry<String, Float> entry : map.entrySet()) {
    sum += entry.getValue();
}

or in this case just:

for (float value : map.values()) {
    sum += value;
}

Float sum = 0f;
for (Float val : map.values()){
    sum += val;
}

//sum now contains the sum!

for循环对于预期的目的确实很好，但是你也可以使用while循环和迭代器......

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